GM Flexplate Ultrashield P/G & 400

The GM Flexplate Ultrashield P/G & 400 from CSR Performance is a composite flexplate shield engineered to protect transmission components and meet SFI 30.1 safety certification standards. This kit is designed specifically for TH350 and TH400 automatic transmissions, offering OEM-level protection in a lightweight composite construction that resists heat and impact while maintaining durability under high-stress engine conditions.

Built from composite materials rather than traditional steel, this flexplate shield reduces rotational mass while delivering superior heat dissipation compared to conventional shields. The black finish resists corrosion and thermal discoloration, making it ideal for both street and competition vehicles. SFI 30.1 certification ensures compliance with safety standards required by sanctioning bodies in drag racing, street racing, and performance engine builds. The shield mounts directly to the flexplate assembly without requiring frame modifications or additional hardware.

This flexplate shield is specified for builds using TH350 or TH400 transmissions—the industry standard for street rod restorations, muscle car builds, and high-horsepower drag applications. Owners of vehicles with these transmissions, particularly those running increased boost or nitrous, benefit from the added containment protection this shield provides in case of catastrophic flexplate failure. The composite construction prevents sharp metal fragmentation issues associated with steel shields and offers weight savings that contribute to improved acceleration metrics in performance vehicles.

CSR Performance specializes in transmission and driveline protection components for performance and racing applications. The Ultrashield series represents the company's commitment to SFI-certified safety solutions that balance regulatory compliance with practical engineering. Whether building a street machine, vintage racer, or competition vehicle, proper flexplate containment is essential insurance against catastrophic drivetrain failures.